Diamante is one of the top three officers of the Donquixote Pirates. He occupies the Diamond seat of the Donquixote Family and is the leader of the crew's Diamante Army subdivision. He was the proprietor of the Corrida Colosseum of Dressrosa, where he earned his title as the "Hero of the Colosseum" (コロシアムの英雄, Koroshiamu no Eiyū?). Due to his actions and role, he is one of the major antagonists in the Dressrosa Arc.